TOI-1278 B: SPIRou Unveils a Rare Brown Dwarf Companion in Close-in Orbit around an M Dwarf

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Artigau, E (Author) Other; Hebrard, G (Author) Other; Cadieux, C (Author) Other; Vandal, T (Author) Other; Cook, NJ (Author) Other; Doyon, R (Author) Other; Gagne, J (Author) Other; Moutou, C (Author) Other; Martioli, E (Author) Other; Frasca, A (Author) Other; Jahandar, F (Author) Other; Lafreniere, D (Author) Other; Malo, L (Author) Other; Donati, JF (Author) Other; Cortes Zuleta, P (Author) Other; Boisse, I (Author) Other; Delfosse, X (Author) Other; Carmona, A (Author) Other; Fouque, P (Author) Other; Morin, J (Author) Other; Rowe, J (Author) Other; Marino, G (Author) Other; Papini, R (Author) Other; Ciardi, DR (Author) Other; Lund, MB (Author) Other; Martins, JHC (Author) Other; Pelletier, S (Author) Other; Arnold, L (Author) Other; Bouchy, F (Author) Other; Forveille, T (Author) Other; N.C. Santos (Author) FCUP; Bonfils, X (Author) Other; Figueira, P (Author) Other; Fausnaugh, M (Author) Other; Ricker, G (Author) Other; Latham, DW (Author) Other; Seager, S (Author) Other; Winn, JN (Author) Other; Jenkins, JM (Author) Other; Ting, EB (Author) Other; Torres, G (Author) Other; da Silva, JG (Author) Other

Journal

Title: Astronomical Journal

Vol. 162

Final page: 144

ISSN: 0004-6256

Publisher: American Astronomical Society

Indexing

ISI Web of Knowledge - 15 Citations

Scopus - 15 Citations

Other information

Authenticus ID: P-00V-D5J

DOI: 10.3847/1538-3881/ac096d

Abstract (EN): We present the discovery of an 18.5 +/- 0.5 M (Jup) brown dwarf (BD) companion to the M0V star TOI-1278. The system was first identified through a percent-deep transit in Transiting Exoplanet Survey Satellite photometry; further analysis showed it to be a grazing transit of a Jupiter-sized object. Radial velocity (RV) follow-up with the SPIRou near-infrared high-resolution velocimeter and spectropolarimeter in the framework of the 300-night SPIRou Legacy Survey carried out at the Canada-France-Hawaii Telescope led to the detection of a Keplerian RV signal with a semi-amplitude of 2306 +/- 10 m s(-1) in phase with the 14.5 day transit period, with a slight but nonzero eccentricity. The intermediate-mass ratio (M-star/M-comp similar to 31) is unique for having such a short separation (0.095 +/- 0.001 au) among known M-dwarf systems. Interestingly, M-dwarf-BD systems with similar mass ratios exist with separations of tens to thousands of astronomical unit.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16